Blocks not converting correctly from 1.12.2 to current snapshot

Blocks affected (list may be incomplete):

• Corner stairs
• Double chests
• Vines
• Connected fences
• Connected iron bars
• Connected redstone dust
• Connected cobblestone walls
• Connected glass panes
• Connected melon/pumpkin stems
• Banner (patten) colors
• Connected chorus plants

Does not seem to be world specific.