Embedding won't unload for the new bundle format when regional prompter is enabled

[cyber-meow]

Describe the bug

A bundle format is recently added to the dev branch of webui: AUTOMATIC1111/stable-diffusion-webui#13568 (for an example file see https://civitai.com/models/173081/)
This can be regarded as a LoRA with multiples built-in embeddings and is particularly relevant for the case of pivotal tuning (training of both LoRAs and embeddings together): https://civitai.com/articles/2494/making-better-loras-with-pivotal-tuning

The normal behavior is that the embeddings are only loaded when the LoRA is used, and otherwise gets unloaded afterwards

Yet, when regional prompter is enabled, the embeddings are never unloaded. For example, I can get such warning which should only occur when embeddings already exist.

The embeddings continue to take effect even if I remove the lora. I guess this is related to how LoRA is loaded in regional prompter.

Environment
Web-UI version: dev commit 464fbcd9
SD Version: 1.5

Other Enabled Extensions
I can observe this behavior when only built-in extensions and regional prompter are enabled.

[hako-mikan]

Fixed.