As the attachment shows, the resource pack can only change the texture of glass bottles, that means except using some technological ways, wanting to see the old color of potions is impossible.
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If Mojang were to officially declare that the old appearances of objects such as items, blocks, or entities from prior versions must always be retrievable through resource packs, then this would constitute a valid issue. Otherwise, it would be considered a feature request. Additionally, reverting to the old bat or vex model is not currently feasible. At present, the colors for non-custom potions are hardcoded and cannot be altered using resource packs.
[MOD] Greymagic27
Thank you for your report!
We're tracking this issue in MC-169889, so this ticket is being resolved and linked as a duplicate.
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