Can no longer enter SKU when copying a listing

Hello

On most of our ASINS I have 2 listings, 1 is FBA and 1 is MFN. I have never had an issue with this. I would simply copy an ASIN listing and I would enter a new SKU which would be the same, just with either FBA or MFN added to it.

I have just gone to copy a listing for an ASIN, the existing listing is set to MFN but now there is no option to enter an SKU, I went ahead and did this but it has given a random SKU, which is not ideal as this doesn't link to anything. So below is what happened;

Existing ASIN: B0B25RFBFG Existing SKU: Y4308 DGPK 1

In the past I would copy this listing so that the SKU was Y4308 DGPK 1_FBA

But as there was no option to enter the SKU, it has given an SKU of BN-QF4J-9OYB obviously I could use this SKU but it doesn't match up with the SKU on our systems outside of Amazon. Also I mainly search by SKU when looking for a listing.

It's worth noting that I the last time I tried this prior to today was 15/09/2023 so I don't know if there's been a change since then. I have tried searching but can't seem to find any mention of this.

We are the manufacturers of the products and this ASIN was created by us initially.

Has anybody encounterd this or got any thoughts.

Thanks in advance.