Here is how I got blending working when linking / unlinking anim layers (Unreal 5.5):
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Generally follow the instructions here: Animation Blueprint Linking in Unreal Engine | Unreal Engine 5.6 Documentation | Epic Developer Community
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In your
Anim Layer Interface
(which defines the layers to your animation), be sure the “Bindings” are set to the “Default Anim Graph Node Binding
” type:
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In your ABP which implements your Anim Layer Interface, click on the layer function and in the Details tab you should see blend times appear:
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In the ABP that uses the linked layers, add an
Inertialization
node after the linkage:
Caveat: Did not try this for multiple linked layers.