Unexpected item state restore with OH4.3

[spacemanspiff2007]

Similar to #3605

Steps to reproduce:

Create a fresh installation of 4.3.3 and install mapdb persistence.

Observe that no standard persistence service is configured:

Create an item and post a state to the item.
Delete item and create it again.
Observe that the previous state is restored through mapdb.

Observed events:

# Create item
{"type":"ItemAddedEvent","topic":"openhab/items/TestItem/added","payload":"{\"type\":\"String\",\"name\":\"TestItem\",\"label\":\"\",\"category\":\"\",\"tags\":[],\"groupNames\":[]}"}

# Udate state
{"type":"ItemStateUpdatedEvent","topic":"openhab/items/TestItem/stateupdated","payload":"{\"type\":\"String\",\"value\":\"my_string\"}"}
{"type":"ItemStateChangedEvent","topic":"openhab/items/TestItem/statechanged","payload":"{\"type\":\"String\",\"value\":\"my_string\",\"oldType\":\"UnDef\",\"oldValue\":\"NULL\"}"}

# Remove item
{"type":"ItemRemovedEvent","topic":"openhab/items/TestItem/removed","payload":"{\"type\":\"String\",\"name\":\"TestItem\",\"label\":\"\",\"category\":\"\",\"tags\":[],\"groupNames\":[]}"}

# Create item with same name
{"type":"ItemAddedEvent","topic":"openhab/items/TestItem/added","payload":"{\"type\":\"String\",\"name\":\"TestItem\",\"label\":\"\",\"category\":\"\",\"tags\":[],\"groupNames\":[]}"}

# Observe state restore
{"type":"ItemStateUpdatedEvent","topic":"openhab/items/TestItem/stateupdated","payload":"{\"type\":\"String\",\"value\":\"my_string\"}"}
{"type":"ItemStateChangedEvent","topic":"openhab/items/TestItem/statechanged","payload":"{\"type\":\"String\",\"value\":\"my_string\",\"oldType\":\"UnDef\",\"oldValue\":\"NULL\"}"}

Since no persistence service is configured as a default persistence no restore should happen.

[mherwege]

This is normal behaviour. Default persistence service is only used as a default when querying persistence. It allows querying without providing the service. This is also used for the graphs in the UI. It has nothing to do with persisting at all.

If nothing is defined, a default strategy for persisting will kick in: the default strategy defined by the persistence service. For mapdb this is persist on change and restore on startup. If you give the new item the same name, it will restore.