EXG only containing MVR with NEXG 0 doesn't work

[tandreasr]

Hi,
while further testing the parallel capabilities of MF6 I found another error connected to splitting a model into subdomains.
Please have a look a the following screenshot:

The original model without any exchanges contained a Mover between two MAW wells located in Subdomain 3 (provider) and 10 (receiver) respectively.
When splitting the original model (test020_NT_EI from https://github.com/MODFLOW-USGS/modflow6-testmodels/tree/master/mf6)
into subdomains this mover obviously has to be moved into a new exchange (File exg_3_10.exg)
This exchange does contain the mover only, because no direct borders do exist between subdomain 3 and 10 - therefore NEXG 0.
This leads to the following error (serial and parallel mode):

ERROR REPORT:

1. IDM unimplemented. StructArray::load_deferred_vector unsupported memtype.

My guess is that you haven't had such a case yet? (which in my opinion should be acceptible)
What do you think?
Here is the splitted model producing the error:
_usgs.zip

Best regards
Andreas

[mjr-deltares]

Nice find! This is an interesting edge case that we will definitely further investigate. Will let you know what possible next steps are. Thanks for reporting @tandreasr