Some posts are not making it to block

It's weird but I have recently came upon an issue where SUBMIT_POST transactions aren't making to block.

for example there is this postHashHex: 4e7bdef3d4c46afe64fc1d97aa154b8135f64ef8a5f16d5f7935dda5ca831ceb which showed all post info through the API for few minutes but now the api is returning

```json
{"error":"GetSinglePost: Could not find postEntry for PostHashHex: 4e7bdef3d4c46afe64fc1d97aa154b8135f64ef8a5f16d5f7935dda5ca831ceb"}
```

Yes, i am 100% sure that the post was successfully submitted using /submit-transaction endpoint.

Start at the /submit-transaction endpoint and the API path returning GetSinglePost, using the supplied PostHashHex to reproduce the disappearance. Trace the transaction from submission through block inclusion and post lookup, then verify that a successfully submitted post remains retrievable after processing.

Written by the indexing model from the issue text.