Just spitballin' here but...
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Since you disabled custom stadiums for H2H as mentioned here:
https://forums.theshow.com/topic/76781/created-stadiums-temporarily-disabled-in-h2h-games
Why not leave that as is in 26, and just implement min/max restrictions(to keep dimensions fair and exploit proof) so we can at least use the custom stadiums in games vs cpu and mini seasons?