There’s recently been a spike in pending mempool transactions (92 as of now) as observed by the nodes hosted by Hiro PBC. Many of these transactions seem to be KuCoin transactions. Hiro engineers wanted to share more information with community members for what we’re seeing on nodes hosted by Hiro PBC:
Pending transactions older than 256 blocks might fail but can be resent. Funds should be safely accessible via the originating address following the transaction failure to be processed.
Only small subset of users are impacted by this. KuCoin is reporting that their users are seeing this issue (KuCoin will have more details and information). Hiro engineers are working on the issue on the open-source code and others can help as well.
The issue here is related to the inclusion logic for mempool transactions. There is a proposed fix for this, but it obviously requires participation from various independent miners.
Hiro engineers think that the code changes can take a day, after that it depends on miners and others to see how quickly the network sees those improvements. You can follow updates on the Stacks Github or here in the forum. Thanks all!