Describe the bug
Magma blocks don't provide fuel until the Brewing stand is brewing.
Also tested with other heat sources: Campfire, Fire, and Lava.

To Reproduce
Steps to reproduce the behavior:

1. Place a Brewing Stand on top of a Magma Block
2. The Brewing Stand's fuel does not increase, and brewing isn't possible

Test:

1. Place a Brewing Stand on a non-heat-source block and insert Blaze Powder as fuel
2. Brew any number of times, leaving some fuel still in the Brewing Stand
3. Remove the block under the Brewing Stand and place a Magma Block under the Brewing Stand
4. The Brewing Stand's fuel doesn't increase
5. Start brewing while the Magma Block is under the Brewing Stand
6. The Brewing Stand's fuel increases while it's brewing

Expected behavior
When placing a Brewing Stand on top of a Magma Block, the fuel should increase passively.

Screenshots
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Pastebin links
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• latest.log:
• Modpack link (preferred) or Mod List: https://pastebin.com/vv6Jg68G
• Custom changes to modpack (if using a modpack):
• Extra Alchemy Config: Default

Environment (please complete the following information):

• Mod Version: 1.9.0
• MC Version: 1.19.2
• Fabric Version: 0.14.9
• Fabric API version: 0.63.0
• System: Windows 10
• Installation type: Dedicated Server

Additional context
Add any other context about the problem here, like other mods that you think might be involved in the problem.

If using the default config, you'll have brewingStandFireMaxCapacity set at 10 out 20.
This means that if you are above half heat, it won't recharge.
Try setting it at 20 to see if it fixes your issue

Perhaps I'm misunderstanding the instructions on heat sources, but with the config set to 20 I'm having difficulities getting the brewing stand to first accept heat sources but once it does it seems to work; although I've never been able to get the stand to work with a slab covering the block.

This one took me a lifetime to figure out.
Add mixin.world.block_entity_ticking.sleeping.brewing_stand = false at the end of the "lithium.properties" file in your config folder server-side.