Network manager gets stuck in wireless hotspot mode when resuming from sleep

Using my laptop as a wireless router for my desktop, I can easily share it's wi-fi internet connection (provided by another wireless router elsewhere in the house) to my desktop by picking the "Shared to other computers" setting under it's configuration.

This works fine.

However, if I put the laptop to sleep (typically because I'm going out with it) then when I eventually get back to the house and try to reconnect it, NetworkManager will insist it's in "wireless hotspot" mode.

This state is persistent - disabling through the GUI does not work, no internet connection is shared and the laptop cannot access the internet itself. A reboot does not fix the problem - the only fix I have found is to go to /etc/NetworkManager/system-connections, open up the file for the network I was using and manually change IPv4 addressing to "auto". Then I have to explicitly disable the wired ethernet interface in order to allow it to resume normal operations.

This fixes things.

None of this is sensible behavior, and I'm wondering if it's come up anywhere else or been fixed in later versions? I'm currently running

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