Hello,
I recommend taking a read of this topic linked below:
The team are aware of this issue emerging with the release of 23.1 and they are working on fixing it as soon as possible.
As mentioned in the topic above, a few ways to avoid it all together are:
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Making sure “Automatic Engine Start” is disabled in settings.
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Start from a gate always and don’t use Take Off or Short Final modes in Solo.
Feel free to take a read of the topic linked above and let us know if you have any additional questions or concerns.
Take care!