Sir,
let me share you a similar practical experience I had first:-
An assessee did not produce the details of 'barclays bank' held in Canada at the time of filing ITR of FY 21-22 as he was not having any continuing relationship with the banker. However, the account was not closed and there was some very small balance lying in that account which even the assessee had forgotten.
In Nov 2022 or so, he received a summons notice from IT Department stating that said a barclays bank account was operational in Canada and whether it was disclosed in return, whether income was included and so on. The Department had stated that this information was received via 'Exchange of Information'.
Since (fortunately), there was no income from that particular account, a reply was given stating the above facts and matter was closed.
Coming to the query,
If there is any tax payable on account of foreign asset in India, it is advisable to file ITR-U. However, if there is no tax implication, then it would not be possible to file ITR-U also.