Inaccessible height in NeoFS Mainnet and Testnet

[cthulhu-rider]

Is your feature request related to a problem? Please describe.

currently, i recv following error for both NeoFS networks

then i can close this popup, still able to enter height range. UI prints hyphen in height place (text is highlighted by me in the ss!)

on try, i get following error on submit

i see in dev console

Access to fetch at 'https://rpc1.morph.t5.fs.neo.org/' from origin 'https://archive.fs.neo.org' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

main.a7e04d21.js:2 
 POST https://rpc1.morph.t5.fs.neo.org/ net::ERR_FAILED

Describe the solution you'd like

working backend

as an enhancement, when current height is rly unreachable, behave either:

• allow to input any valid border. Afaik right now it is stopped by UI
• disable inputs while current height cannot be recved

Versions used

• Google Chrome Version 131.0.6778.139 (Official Build) (64-bit)