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It might be related to the map itself. Try posting in the Paragon group on VK. Maybe the map author can offer some advice; Baratorch is unlikely to be able to help.
But usually, single-player maps are played without HD+, or with SOD_SP added. So you can safely disable HD+ and play normally.
In general, it's not that simple.
I found the installer for an older version of the mod: 5.0 RC 46 (March 2019).
And there is no such problem in it under the same conditions.
I highly doubt that the issue is with the map.
Regarding sod_sp - I checked it out, it's a powerful thing, thanks.
But there's a lot of stuff there; I only enable HD+ for one feature - to be able to quickly replay a battle without worrying about saving and loading. :)