All data, I was able to gather is described in detailed way on BI Forums:
(too big data to paste here). It was spotted first time on A3 1.44 and keep happening to me on 1.48. It happens also for editor preview. Changing A3 profile makes no difference, Arma files integrity confirmed.
If still not present after several tries, note: most of these errors are not confirmed by other Pilgrimage players, I asked, while for me it happens often in "random" manner. Except "Inventory" error, confirmed by many.
On the side note would be great, if such kind of error wouldn't break loadingScreen, which force all further initialization under simulation pending with extreme performance consequences for heavy init code.