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I'm not sure that this issue is a poppler one per se, but I encountered it with several poppler based PDF readers on Linux: Zathura, Okular and Evince: if the code between "Or through a dictionary:" and "Or if you want to exclude the possibility [...]" page 3 of this PDF document:

\pdfdict_new:n {l_my_action_dict}
\pdfdict_put:nnn {l_my_action_dict}{Type}{/Action}
\pdfdict_put:nnn {l_my_action_dict}{S}{/URI}
\pdfdict_put:nnn {l_my_action_dict}{URI}{(https://www.latex-project.org)}
\pdfannot_dict_put:nnn {link/URI} { C } {[1~0~0]} %red border
\pdfannot_link:nxn { URI }
{
/A <<\pdfdict_use:n{l_my_action_dict}>>
}
{ link text }

is copied, it is pasted as:

\pdfdict_new:n
\pdfdict_put:nnn
\pdfdict_put:nnn
\pdfdict_put:nnn
{l_my_action_dict}
{l_my_action_dict}{Type}{/Action}
{l_my_action_dict}{S}{/URI}
{l_my_action_dict}{URI}{(https://www.latex-project.org)}
\pdfannot_dict_put:nnn
{link/URI} { C } {[1~0~0]} %red border
\pdfannot_link:nxn { URI }
{
/A <<\pdfdict_use:n{l_my_action_dict}>>
}
{ link text }

According to this comment, this trouble doesn't arise with PDF readers not based on poppler.