Version 91 or higher all have this problem. Only pre-installed extension can run because they are allowed to run in private browsing.
You aren’t supposed to add extra extensions as it will make you stand out against everyone else who doesn’t
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Bug report for this issue: [Bug] [Android] New addons are not being enabled in Tor browser (#40606) · Issues · The Tor Project / Applications / Tor Browser · GitLab
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