If you want evidence that "the R5 will overheat and refuse to shoot still images, while shooting still images, alone (no video)," well, Canon's manual implies this can happen and forumers posting here have said, anecdotally, that it has happened to them.
Given I don't own an R5, myself, I can't go out and test it, but I look forward to others doing so, and I have absolute certainty that when they do, someone will share their findings here
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