p7zip fails when extracting XIP file/Xar archive (regression?)

Homebrew recently updated 7z to p7zip Version 17.03, and now it fails to extract XIP files which have worked flawlessly with the previous version.

Full output for 7z e Xcode_12.4.xip:

7-Zip [64] 17.03 : Copyright (c) 1999-2020 Igor Pavlov : 2017-08-28
p7zip Version 17.03 (locale=utf8,Utf16=on,HugeFiles=on,64 bits,4 CPUs x64)

Scanning the drive for archives:
1 file, 11655535601 bytes (11 GiB)

Extracting archive: Xcode_12.4.xip
         
Content
ERRORS:
There are data after the end of archive

--
Path = Xcode_12.4.xip
Type = Xar
Physical Size = 11655535601
Headers Size = 3973
----
Path = Content
Size = 11655531068
Packed Size = 11655531068
Modified = 2021-01-09 01:51:35
Created = 2021-01-09 01:51:35
Accessed = 2021-01-09 01:25:24
Mode = -rw-r--r--
User = root
Group = wheel
Method = octet-stream
--
Path = Content
Type = xz
ERRORS:
There are data after the end of archive
Offset = 28
Physical Size = 3466672
Tail Size = 11652064368
Method = LZMA2:23
Streams = 1
Blocks = 1
Characteristics = BlockPackSize BlockUnpackSize

ERROR: There are some data after the end of the payload data : Content~

Sub items Errors: 1

Archives with Errors: 1

Open Errors: 1

Sub items Errors: 1

The file can be downloaded from https://developer.apple.com/download/more/ ; I sadly don't have another test file 😕

I see that p7zip16.02 will report the same problem, but p7zip16.02 is handled as a warning, and p7zip17.03 is handled as an error. I want to confirm, is there any error in the decompressed file of p7zip17.03?

If I use p7zip16.02 from here, it fails with a different error message:

7-Zip (a) [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,4 CPUs x64)

Scanning the drive for archives:
1 file, 11655535601 bytes (11 GiB)

Extracting archive: /Volumes/macOS Data HDD/Xcode_12.4.xip
         
ERRORS:
There are data after the end of archive

--
Path = /Volumes/macOS Data HDD/Xcode_12.4.xip
Type = xz
ERRORS:
There are data after the end of archive
Offset = 4277
Physical Size = 3466672
Tail Size = 11652064652
Method = LZMA2:23
Streams = 1
Blocks = 1

ERROR: There are some data after the end of the payload data : Xcode_12.4

Sub items Errors: 1

Archives with Errors: 1

Open Errors: 1

Sub items Errors: 1

However in both cases it extracts only 16.777.216 bytes (which are the same for both 16.02 and 17.03). Does that answer your question?