Can't sign transactions with MM after new network was just added

[jagodarybacka]

          When I try to connect do dapp with MM on a Ethereum network I'm asked if I allow for changing the network (that's correct). But in the dapp's logs I can see a bunch of errors at that point (I'm not sure if they are expected). Once I allow, I'm successfully connected to dapp and the network changes to Arbitrum Sepolia in MM (correct).

Originally posted by @michalinacienciala in #788 (comment)

[michalinacienciala]

Originally posted by @michalinacienciala in #788 (comment)

Just to clarify, that comment did not mention the tx signing issue, just the suspicious comments (which may be linked to the issue). More details on the issue is in this comment.