Error: TokenService Error: ChainId 0x539 is not supported

Greetings, there is a weird error after the latest update of MM!
There is no more option to use custom tokens in the network with chainId: 1337.

Error: TokenService Error: ChainId 0x539 is not supported
at common-0.js:1:248643 - sentry-install.js:1

We use the Hyperldeger Besu network in our dev environment with chainId: 1337
before all worked great
there was no issue with adding it as a custom network in MM
there was no issue with showing the current ETH balance in that network.

BUT
now, when trying to import a custom ERC20 token deployed in that network, MM acts weirdly:

after entering the custom token’s address - MM shows a Symbol and Decimals according to the contract.
after pressing the “Add custom token” button - it correctly indicates the current balance in the next window.
then after pressing the “Import tokens” button window closes and just nothing happens…

The error appears only in the browser dev console
Error: TokenService Error: ChainId 0x539 is not supported at common-0.js:1:248643
sentry-install.js:1

reopening the same issue as [Not able to import custom tokens on MM from Ganache]
and can’t understand why it was closed a few weeks ago without any reason.

What’s the point of not supporting a 1337 network, despite MM clearly can interact with it?
Guys, you have to fix it asap or at least do a statement that custom networks are no longer supported.