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PcMc Tampermonkey is closed-source. You can find the related discussions in https://orionfeedback.org/d/547-tampermonkey-violentmonkey-do-not-work-properly/
Tampermonkey is not working in Orion but no one knows why.
I have liaised with Violentmonkey's author only. If you insist to use Tampermonkey, you need to find Jan Biniok to talk to him directly to investigate the root cause.
Most scripts can be installed in Violentmonkey as well. I use it everyday.