fix warming-up position incorrectly when 2 phrase prefix query are issued for the same final term

[trinity-1686a]

Description

fix a bug where field:"short"* field:"not short"* would succeed, but field:"not short"* field:"short"* would fail to load position, and return an error

How was this PR tested?

tested manually, added unit test for the faulty code

[github-actions]

On SSD:

Average search latency is 0.996x that of the reference (lower is better).
Ref run id: 2929, ref commit: 995bb62
Link

On GCS:

Average search latency is 0.998x that of the reference (lower is better).
Ref run id: 2930, ref commit: 995bb62
Link

[fmassot]

Good job!!!!!