Server serving incorrect merkle proofs for reorged block height

[SomberNight]

My server is returning incorrect merkle proofs for a block: https://blockstream.info/block/00000000000000000008fc27ad8c46149aa12bb12866fde846c93365591314f7 (height 599_587) (at the time, this was ~50 blocks from the tip).
The proofs are correct for the block before and the block after.

I checked in bitcoind, and there was a reorg at that height:

bitcoin-cli getchaintips
[
  {
    "height": 599642,
    "hash": "00000000000000000005ef3fa4bef253ea3be4892d3ebdc633b949aae5401923",
    "branchlen": 0,
    "status": "active"
  },
  {
    "height": 599587,
    "hash": "00000000000000000012e55a5c5b0464ceab40b29af6cacb4b02ef6cc009a4b4",
    "branchlen": 1,
    "status": "valid-fork"
  },
...

I think the server might be returning caches merkle proofs for this block height (corresponding to the old block). Although from a cursory look, it seems in case of a reorg the cache is invalidated.

[SomberNight]

After restarting the server, it returns correct merkle proofs; furthering the cache theory.