Citation showing "a" "b" like (2018a) and (2018b) when the author list is different

Question

So the problem is that, even when the author list is different, it adds "a" "b" like 2018a and 2018b, if the first author is the same. This problem does not seem to happen if the article type is @techreport instead of @article.

This is the entire code.
% Preview source code

%% LyX 2.3.3 created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
documentclass[english]{article}
usepackage[T1]{fontenc}
usepackage[latin9]{inputenc}
usepackage{geometry}
geometry{verbose,lmargin=3cm,rmargin=3cm}
PassOptionsToPackage{natbib=true}{biblatex}
usepackage{color}
usepackage{babel}
usepackage{setspace}
usepackage[unicode=true,pdfusetitle,
 bookmarks=true,bookmarksnumbered=false,bookmarksopen=false,
 breaklinks=false,pdfborder={0 0 1},backref=false,colorlinks=true]
 {hyperref}
hypersetup{
 linkcolor=blue, urlcolor=blue, citecolor=blue}

makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
usepackage{amssymb}
usepackage{afterpage}
usepackage{blindtext}
usepackage{graphicx}
usepackage{changepage}
usepackage{afterpage}

usepackage{newunicodechar} 
DeclareUnicodeCharacter{FFFD}{?????}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Code for citation in good style
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

usepackage[style=authoryear, uniquename=false, uniquelist=false, maxbibnames=99]{biblatex}
renewbibmacro{in:}{}
usepackage{hyperref}

% Just for demo
ExecuteBibliographyOptions{maxcitenames=1}

DeclareFieldFormat{citehyperref}{%
  DeclareFieldAlias{bibhyperref}{noformat}% Avoid nested links
  bibhyperref{#1}}

DeclareFieldFormat{textcitehyperref}{%
  DeclareFieldAlias{bibhyperref}{noformat}% Avoid nested links
  bibhyperref{%
    #1%
    ifbool{cbx:parens}
      {bibcloseparenglobalboolfalse{cbx:parens}}
      {}}}

savebibmacro{cite}
savebibmacro{textcite}

renewbibmacro*{cite}{%
  printtext[citehyperref]{%
    restorebibmacro{cite}%
    usebibmacro{cite}}}

renewbibmacro*{textcite}{%
  ifboolexpr{
    ( not test {iffieldundef{prenote}} and
      test {ifnumequal{value{citecount}}{1}} )
    or
    ( not test {iffieldundef{postnote}} and
      test {ifnumequal{value{citecount}}{value{citetotal}}} )
  }
    {DeclareFieldAlias{textcitehyperref}{noformat}}
    {}%
  printtext[textcitehyperref]{%
    restorebibmacro{textcite}%
    usebibmacro{textcite}}}

makeatother

usepackage[style=authoryear]{biblatex}
addbibresource{References_test2.bib}
begin{document}
begin{doublespace}
citet*{suarez2018unintended}

citet*{suarez2018testtesttest}

citet*{last2018test1}

citet*{last2018test2}
end{doublespace}

pagebreak{}

printbibliography

pagebreak
end{document}

And Reference_test2.bib has this.
% Encoding: UTF-8

@techreport{suarez2018unintended,
  title={Test1},
  author={Su{'a}rez Serrato, Juan Carlos and Einstein, Albert},
  year={2018},
  institution={Journal1}
}

@techreport{suarez2018testtesttest,
  title={Test2},
  author={Su{'a}rez Serrato, Juan Carlos},
  year={2018},
  institution={Journal2}
}

@article{last2018test1,
  title={test1},
  author={Last, First and Lasttwo, Firsttwo},
  journal={Journal1},
  year={2018}
}

@article{last2018test2,
  title={test2},
  author={Last, First and Lasthi, Firsthi and Laster, Firster},
  journal={Journal2},
  volume={30},
  number={2},
  pages={47--60},
  year={2018}
}
@Comment{jabref-meta: databaseType:bibtex;}

moewe · Answer

This is an interesting effect. It can be reproduced in the following reduced MWE
documentclass{article}

usepackage[style=authoryear,
  maxbibnames=99,
  maxcitenames=1,
  uniquename=false,
  uniquelist=false,
  natbib=true]{biblatex}

begin{filecontents}{jobname.bib}
@article{last2018test1,
  title   = {test1},
  author  = {Last, First and Lasttwo, Firsttwo},
  journal = {Journal1},
  year    = {2018},
}
@article{last2018test2,
  title   = {test2},
  author  = {Last, First and Lasthi, Firsthi and Laster, Firster},
  journal = {Journal2},
  volume  = {30},
  number  = {2},
  pages   = {47--60},
  year    = {2018},
}
end{filecontents}
addbibresource{jobname.bib}

begin{document}
citet*{last2018test1}

citet*{last2018test2}

citet{last2018test1}

citet{last2018test2}

printbibliography
end{document}

Clearly the 'a' and 'b' are not necessary to uniquely identify the entries.
The 'problem' here is the usage of the starred natbib compatibility command citet*. In natbib compatibility mode citet* produces the output of citet (textcite in biblatex speak) but with the full author list no matter what maxcitenames says.
Compare that with the output you would get from 'normal' citet, which is

Here the 'a' and 'b' are necessary to be able to uniquely match the two citations to the bibliography entries.

Depending on the desired output there are several things you can do.
I would probably arrange things so that I don't have to use citet* all the time. This could be done by dropping the maxcitenames and uniquelist options.
documentclass{article}

usepackage[style=authoryear,
  maxbibnames=99,
  uniquelist=false,
  natbib=true]{biblatex}

begin{filecontents}{jobname.bib}
@article{last2018test1,
  title   = {test1},
  author  = {Last, First and Lasttwo, Firsttwo},
  journal = {Journal1},
  year    = {2018},
}
@article{last2018test2,
  title   = {test2},
  author  = {Last, First and Lasthi, Firsthi and Laster, Firster},
  journal = {Journal2},
  volume  = {30},
  number  = {2},
  pages   = {47--60},
  year    = {2018},
}
end{filecontents}
addbibresource{jobname.bib}

begin{document}
citet*{last2018test1}

citet*{last2018test2}

citet{last2018test1}

citet{last2018test2}

printbibliography
end{document}

But if you want different output, maybe you need slightly different settings.

Citation showing "a" "b" like (2018a) and (2018b) when the author list is different

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