Game version: 1.66.139586
Branch: main / beta branch not specified

(See attached pictures)
"NATO.Marksman(MTP)HK417 Night" loads with BIS Arsenal
"NATO.Marksman(MTP)MAR-10" LOAD button greyed out in BIS Arsenal; can load with XLA Arsenal however
Can save "NATO.Marksman(MTP)MAR-10" with XLA as ""NATO.Marksman(MTP)MAR-10 temp", but resulting profile cannot be loaded in BIS Arsenal; LOAD button greyed out.
The last profile to not be loadable in BIS Arsenal is NATO.Medic(MTP)MX. However, loading in XLA then saving as "NATO.Medic(MTP)MX temp" allows the aforementioned temp profile to be loaded in BIS Arsenal.
Began to suspect a fixed 'black hole' range where anything that slips into it cannot be loaded. So, created "NATO.Marksman(MTP)HK417 Night unreadable 1". Success - the previously non-working "NATO.Medic(MTP)MX" slips down the list; can now be loaded.
Created "NATO.Marksman(MTP)HK417 Night unreadable 2", "NATO.Marksman(MTP)HK417 Night unreadable 3", and "NATO.Marksman(MTP)HK417 Night unreadable 4" to push "NATO.Marksman(MTP)MAR-10" into loadable range.
Problem confirmed to be a fixed range where anything which slips into it is un-loadable.
Will be a problem again when alphabetically inferior profiles saved above will push loadable profiles down into unloadable "black hole."
Uncertain what initially caused this, thus unable to reproduce. $username$.vars.Arma3Profile attached for reference.