ugly work-around to prevent plugins from breaking timelines

What does this PR do?

please read the comment and this ticket I opened upstream: https://github.com/misskey-dev/misskey/issues/14050

this is not a good fix, but it restores the previous behaviour

@Leah please test!

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requested review from @Leah, @tess, @luna, and @kakkokari-gtyih

approved this merge request

By the way for people testing this I suggest using dakkars example plugin posted on a misskey bug report here. https://github.com/misskey-dev/misskey/issues/14050

approved this merge request

resolved all threads

merged

mentioned in commit c57931d4

I also made some tricky workaround for this: https://github.com/misskey-dev/misskey/pull/14117

But actually this needs to be fixed in AiScript itself. I'll post issue to AiScript so that AiScript team will look into this
Update: done https://github.com/aiscript-dev/aiscript/issues/710

resolved all threads

mentioned in issue #578 (closed)