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I've tried disabling everything I can possibly disable on the stock app to prevent the stock app from "hijacking" the MMS incoming/outgoing, I've disabled all the power management, cleared cache, uninstall/reinstall Textra, resync, everything. I have tried a couple of other third-party text apps and the exact same issue, MMS will not send at all or is delayed for hours. I can send/receive MMS in the stock Messenger just fine but Textra will fail (Timeout: Can't get MMS) or send the message several hours later whereas the stock app goes through instantly. I have been back and forth with Verizon and with Textra about this and unfortunately it looks like (at least in my case) it is Android that is causing the issue. On current version I do not see Legacy or System options in Settings.
