Hull Executive AP 1st Class Ticket

I'm looking to buy a 1st class ticket to London next Wednesday on the 06:58 Hull to London.
and I see that there are AP tickets from Newark but not from Hull or Doncaster. Normally I would expect AP tickets to be available from both of those stations on this service or, as happened a few weeks ago, none at all for any calling points.
I'm wondering why the discrepancy this time. As of a moment ago there are still a number of vacant 1st class seats available.

Anecdotally, LNER is throttling Advance availability in some weird and wonderful ways at the moment.

Certain stations and origin/destination combinations are apparently being particularly targetted, with quotas as low as nil or just two at a given tier from the moment of on-sale.

Would you know, or like to speculate as to why this might be? Forcing people to buy flexible tickets where they're allocated a decent percentage of the fare or uncertainty with stock issues so not wanting to release too many (or any advances) incase they cancel the service?

A new Revenue Management system has been introduced and like most new systems there is a bedding in period and a steep learning curve.

Wallsendmag said:

A new Revenue Management system has been introduced and like most new systems there is a bedding in period and a steep learning curve.

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So passengers end up paying more if they don't know about splitting.

westv said:

So passengers end up paying more if they don't know about splitting.

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Or potentially not travelling with them at all....

Of course, only LNER will know what revenues and loads are looking like, but from the outside, their (continuing from Virgin Trains East Coast) implementation of new technology/systems does have a habit of looking a bit questionable at the best of times, so who knows how it will be affecting things.

It's certainly creating passenger issues that I'm aware of.