fix wrong traversing events with hive.app_next_block

The fixed problem may be responsible for HAF crashes during fork reported by users. In some circumstances repeated in the test added with this commit a context back to already processed event what is a violation of a HAF rule and leads to problems with clearing events queue and reversible data.

requested review from @bwrona

assigned to @Ickiewicz

added 2 commits

• ba0f77c8 - 1 commit from branch develop
• 0cac0b50 - fix wrong traversing events with hive.app_next_block

Compare with previous version

added 1 commit

• ecec6072 - fix wrong traversing events with hive.app_next_block

Compare with previous version

added 2 commits

• ba0f77c8 - 1 commit from branch develop
• c22f7952 - fix wrong traversing events with hive.app_next_block

Compare with previous version

merged

mentioned in merge request !316 (merged)