I was playing Space Age and I had the green Space Age turbo belts in some blueprints, and then started a run with Bob's Logistics enabled. After reverting back to a Space Age save without Bob's Logistics on, all my blueprints that had Space Age turbo belts consider those belts to be modded content. Can that be fixed? Thanks!

same happend to me, all my blueprint that contained space age turbo belts are now broken and no longer usable without Bob's Logistic enabled

only way around this is to enable the mod, downgrade everything down to express then upgrade them again once the mod is disable

but also doing it this way will break any belt weaving, hope there can be a fix for this

aint fun to have all my space age blueprints ruined due to this "bug"

I'm pretty sure I know what is causing this. Yes, I'll get it fixed soon!

Dear respected author,I have spent 4000 hours playing Factorio and have always enjoyed creating blueprints in the vanilla, mod-free version of the game. However, I recently joined a friend's server and played with Bob's mods for just two hours before disabling them right away. Unfortunately, more than half of the blueprints in my blueprint library became corrupted.
If possible, I hope you can add a warning on the mod's description page that says:"This mod may damage local blueprint books."
The blueprints I created throughout last year are almost completely ruined. After removing Bob's mods, the number of code lines in my blueprint files was cut directly in half. Many conveyor belt entities were deleted when Bob's mods were disabled, leaving only their positional data.
I expect it will take me a huge amount of time to fix all the blueprints again this year. It’s hard to imagine how many players will run into similar issues after version 2.0 comes out.I hope you can resolve this problem as soon as possible.

Got hit with this bug, and tried to fix things afterwards, and it seems to have worked. The bug looks like a problem in the migration to 2.0, since before that turbo-transport-belt (and splitters/undergrounds) was a bob's logistics entity name. Now that its within space age, that name is exactly the same. And so the migration 2.0 json converts over those items, entities, and recipes to bob-turbo-transport-belt. I would think that with the optional dependency on SA it can just share the entity name and the new name is unnecessary. Sadly now that the rename has been done, I would think a new update might break existing saves, but perhaps a new migration that converts those bob-turbo-tra... back to their SA name would work. I tested that out by adding a 2.0.6 json with just that and making a save without the mod, then loading that save with the mod (to force the migration). And that worked to restore the blueprints to the way they were.

is there any intent to fix this issue or will it be breaking blueprints forever?

cant say it is smart to be a well known mod only for it to break blueprints for over a year

I found a Fix!
1: Load both “Space Age” and only “Bob’s Logistics” with its dependencies
2: Under mod options, turn off "Transport Belt Overhaul" and restart, this will cause both types of Turbo Belts to load in a single save
3: Start any save, preferably a sandbox save to unlock everything
4: Make an Upgrade Planner converting Bob’s “Purple Turbos” to Space Age’s “Green Turbos”, and apply it to all the affected blueprints (I moved my library into a single book and converted it in one go).
5: Unload “Bob’s Logistics” and its dependencies
6: Profit!

Edit: It's a Partial fix, it doesn't change the recipes within the blueprint. The only way to change that is to place the blueprint, change the machines to the correct production, then rescan the blueprint.

Столкнулся с проблемой!
В комбинаторе (любом) есть только рецепт "Серной кислоты", "Серы" и так далее. При использовании модов есть альтернативные рецепты.
Но в комбинаторе их нет. И нет возможности установить рецепт на "Химические печи" такой как я хочу, а не тот что выбирается по стандарту.

Fixed!