Hybris v.1905 Cannot unwrap the Remote. 'GenericItemEJBImpl' doesn't expose the Remote - sap

Question

After hybris upgrade 6.7 -> 1905, stared getting errors during categories import via hot folder
Caused by: java.lang.UnsupportedOperationException: Cannot unwrap the Remote. 'GenericItemEJBImpl' doesn't expose the Remote.
at de.hybris.platform.core.WrapperFactory.unwrap(WrapperFactory.java:788) ~[coreserver.jar:?]
at de.hybris.platform.core.WrapperFactory.unwrap(WrapperFactory.java:753) ~[coreserver.jar:?]
at de.hybris.platform.core.WrapperFactory.unwrap(WrapperFactory.java:748) ~[coreserver.jar:?]
at de.hybris.platform.persistence.ItemEJBImpl.unwrap(ItemEJBImpl.java:370) ~[coreserver.jar:?]
at de.hybris.platform.persistence.link.LinkEJBImpl.setSource(LinkEJBImpl.java:65) ~[coreserver.jar:?]
at de.hybris.platform.jalo.link.Link$4.compute(Link.java:250) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item$CachedSetter.tryToCompute(Item.java:934) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item$CachedSetter.set(Item.java:927) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item$CachedSetter.set(Item.java:884) ~[coreserver.jar:?]
at de.hybris.platform.jalo.link.Link.setSource(Link.java:253) ~[coreserver.jar:?]
at jdk.internal.reflect.GeneratedMethodAccessor3776.invoke(Unknown Source) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at de.hybris.platform.jalo.type.ReflectionAttributeAccess$AttributeMethod.invokeSetter(ReflectionAttributeAccess.java:818) ~[coreserver.jar:?]
at de.hybris.platform.jalo.type.ReflectionAttributeAccess.setValue(ReflectionAttributeAccess.java:1005) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item.setAttribute(Item.java:2383) ~[coreserver.jar:?]
at de.hybris.platform.jalo.link.Link.setAttribute(Link.java:146) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item.setAllAttributesInternal(Item.java:2203) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item$18.execute(Item.java:2145) ~[coreserver.jar:?]
at de.hybris.platform.tx.Transaction.execute(Transaction.java:1181) ~[coreserver.jar:?]
at de.hybris.platform.tx.Transaction.execute(Transaction.java:1149) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item.setAllAttributes(Item.java:2140) ~[coreserver.jar:?]
at de.hybris.platform.jalo.Item.setAllAttributes(Item.java:2120) ~[coreserver.jar:?]
Had no luck in debugging since IDE could not decompile de.hybris.platform.core.WrapperFactory
Googling also did not make issue more clear
So any help with understanding what is going on will be appreciated
UPD
Issue is actual for 1905 OOTB B2B Accelerator (https://help.sap.com/viewer/4c33bf189ab9409e84e589295c36d96e/1905/en-US/8acc8a5a86691014a20781b3f738213e.html)
To reproduce it following impex can be used:
$productCatalog=Default
$catalogVersion=catalogversion(catalog(id[default=$productCatalog]),version[default='Staged'])[unique=true,default=$productCatalog:Staged]
$supercategories=source(code, $catalogVersion)
$categories=target(code, $catalogVersion)[unique=true]
INSERT_UPDATE CategoryCategoryRelation;$categories;$supercategories;
;brands:electronicsProductCatalog;brand_75:electronicsProductCatalog;
Setting to false the property persistence.legacy.mode solves the issue, but I'm not sure that it's the right way to fix it