Extraction of `TITLEPIC` horribly broken for specific WAD

[mooreye]

deutex 5.2.3 on Linux.

WAD in question: https://www.doomworld.com/idgames/levels/doom2/Ports/megawads/judgment
I used doom2.wad as IWAD.

There are 2 TITLEPIC lumps inside: one PNG, and one doom format.

When I do: deutex -get titlepic judgment.wad I get:

i WR19 Reading WAD ./doom2.wad:	(2919 entries)
w WR11 judgment.wad has more than 4046 lumps: vanilla-incompatible
i WR19 Reading WAD judgment.wad:	(5787 entries)
i PL05 Palette is Doom
i GE02 judgment.wad: TITLEPIC: extracting
w PI13 Picture TITLEPIC(0): post starts past EOL, skipping rest of column
w PI13 Picture TITLEPIC(1): post starts past EOL, skipping rest of column
w PI13 Picture TITLEPIC(2): post starts past EOL, skipping rest of column
w PI11 Picture TITLEPIC(3): column has bad offset 201261056, skipping column
w PI12 Picture TITLEPIC(4): column has suspicious offset -520
w PI16 Picture TITLEPIC: 20609 warnings omitted
i GE04 Picture insertion point is (2573,2586)
i AA99 Normal exit

The resulting titlepic.png file is 20 617 px wide and 18 254 px high. It is obviously mangled and displays seemingly random column of differently-colored pixels upon heavy zooming, like this (grey is transparent background):

However, when I do deutex -xtract judgment.wad, the graphics/titlepic.png is fine:

[mooreye]

It seems like deutex is treating TITLEPIC lump as doom format, while it is actually already a PNG, and the conversion results in undefined behavior.

Deutex should detect this and just extract a PNG without any conversion in such case.

A workaround would be to extract the doom format TITLEPIC one, but how? It seems deutex has no way to -get non-first lump with the same name.