Random pointers although I'm not sure those are identical to my issue:
https://www.reddit.com/r/archlinux/comments/199am0a/thinkpad_t14_suspend_broken_in_kernel_670/
https://discussion.fedoraproject.org/t/random-resume-after-suspend-issue-on-thinkpad-t14s-amd-gen3-radeon-680m-ryzen-7/103452
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Multiple suspends in a row worked without an external monitor connected,
but after connecting it the machine failed to suspend/resume.
** Attachment added: "failed_on_suspend_after_connecting_monitor.log"
kernel log when trying suspend/resume twice in a row. The machine got
frozen while the power LED is still on in the second suspend and there
is no second "PM: suspend entry (s2idle)" in the kernel log.
** Attachment added: "failed_on_second_suspend.log"
