Disappearing Tokens from Previous Events?

I had seen multiple people here in the forums talk about saving tokens from one run of an event so they could use them at a later time when the event was run, just in case there was a better batch of characters in the vault. I tried that recently with the previous iteration of Honor Among Thieves once I got the 4-star cover that I needed. I ended up saving seven tokens from that event, and they sat unused in the saved tokens category, well past the Deadpool Daily vaults that appear every five days.
Now that Honor Among Thieves is up again, and Mysterio is the featured 4-star (I don't have him champed, and the yellow progression cover will go into the saved pile for my 1/2/5 character) I thought I'd be able to use those seven tokens. Instead, they're gone. Is this normal? Is it something that happened due to the engine overwrite?
I still have seven tokens saved from The Hunt, five from Deadpool vs MPQ, and four from Hearts of Darkness. My 45 saved tokens from the Savory DDQ remained intact, and transferred over to the new vault.
Now that Honor Among Thieves is up again, and Mysterio is the featured 4-star (I don't have him champed, and the yellow progression cover will go into the saved pile for my 1/2/5 character) I thought I'd be able to use those seven tokens. Instead, they're gone. Is this normal? Is it something that happened due to the engine overwrite?
I still have seven tokens saved from The Hunt, five from Deadpool vs MPQ, and four from Hearts of Darkness. My 45 saved tokens from the Savory DDQ remained intact, and transferred over to the new vault.
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Were the saved tokens for a regular event vault? If they were for a "$character & friends" vault or a new character release store, then they won't carry over to this vault.
I actually had an old Honour Among Thieves vault token that I was able to use this time: the last few times this event came up it was during a character release, so I had been holding on to it for months. Made sure I remembered to open it this time.