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Essentially, the postscripts show that on 23 May 1646 the son Francis Stebbyng asked the court to let him have the original will back, proving his entitlement to the greater part of the lands and tenements that had been left him in his father's will. The Chancellor, Clement Corbett, issued a decree in favour of this.

An exact copy of the will was then made and cross-checked with the original. The court would keep this copy, and when Francis returned the original into court it would be checked against the copy to ensure that nobody had tried to alter the original. This was standard practice.

The signatures are simply to confirm and witness what had been agreed. (Turfett is the Notary Public.)

... the MP is Sir Thomas Travell.

Good call. The Tr... is easy to see (once you know!).

Looking at some London parish register indices I am puzzled how they show some (although not as many as usual, admittedly) for birth, deaths and marriages that took place after the church had burned down and years before it was rebuilt.

Many parishes in the City of London were united after the Great Fire. They shared a church, but the physical delimits of each parish were observed for administrative purposes, even though the church building had been destroyed.

Some united parishes kept combined registers, others kept separate registers. For those with separate registers, events were recorded in the appropriate register according to the parish where people lived.

One small suggestion: I think the date of probate was 29 (not 20) February 1423.

Agreed. So even more likely to be 1423/24.

I think FPH stands for From Poplar House, meaning 'admitted from Poplar Workhouse'.

The Stepney union and the Poplar union were adjacent and shared some facilities. Bromley House, though managed by Stepney, was actually located in St Leonard's Street, Poplar.

https://www.workhouses.org.uk/Poplar/#Post-1834
“During this period, Poplar had an arrangement with the adjacent Stepney union to accommodate its other classes of inmate, with the aged and infirm going to Stepney’s workhouse at Bromley …"