pressing the forwards button and then the inventory button quickly will cause the inventory screen to rapidly flash on and off which could trigger photo sensitivity problems
Linked issues
duplicates 1
Comments 2

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We're tracking this issue as MC-93437, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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it appears to work with any other key so long as you press that one first and continue to hold it while pressing the inventory key