Transaction pending: This txn hash was found in our secondary node and should be picked up by our indexer in a short while

[geoshak]

Describe the bug
We have been using biconomy for months to develop a dApp.
Today issuing transactions stopped working.
The transaction still goes through to the mempool on polygon mumbai,
but it gets stuck there with the message:

Pending This txn hash was found in our secondary node and should be picked up by our indexer in a short while.

After a few minutes, the hash is gone from polygonscan.

Expected behavior
Transaction should be mined and confirmed.

Mexa SDK version (please complete the following information):

• Version: [e.g. 2.0.38]

Additional context
It seems like using a higher gasPrice could solve the issue.
But how can we set the gas manually when issuing a transaction through biconomy/mexa?