Paper Size is missing

Question

My environment:

MacBook Pro M1 Max
Lr Classic: 14.0
Printer: EPSON SC-P700

The issue is about available in printing module paper sizes and paper handling. Let me show you some screenshots:

Paper sizes in LrC:

As you see e.g. 10x15 (4x6") format is missing. As well as A3+ is missing (however you may use SuperB/A3 instead). Thanks to the Custom Size option I defined 10x15 but LrC produces very strange results (please ignore the color quality of the photo of the printing):

Printing parameters: "rotate to fit, maximum size (margins 0,3cm).

In opposition, Ps sees the available formats as follows:

As you see 4x6 is pre-defined but what is more interesting - printing is 100% proper.
 
To complete the problem. Standard MacOS viewer shows the following formats for this printer:

Any idea what is wrong? Any workaround?
 
Regards,
Tomek

Big_Lynx · Answer

After plenty of tests, I found a very strange workaround. To properly print on 10x15 (4x6) paper size you can't use user-defined size (see my previous post on how the printing looks like) but you have to use an existing paper format and adjust cell size and it's a position to receive proper prints. Here is the configuration that works for me:

In summary, this is not just a specific paper size missing in the Lr module's communication with the printer driver; this is just the bug.

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