I actually use two instances this way — one in the main profile, and one in the work profile. You just need to set the default GUI port in the app settings for the work instance to something else than 8384, e.g. 8385, and Syncthing should load just fine. Once loaded, you should also open the Web GUI, go to the Advanced Configuration → Options and change the port in Local Announce MC Addr and Local Announce Port there the same way, e.g. from the default 21027 to 21028.
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