Loading existing design - problems with button icons, page background color

I'm trying to extend my design with your beautiful designer - many thanks for your impressive work! I use individual page colors (that are ignored on import) and button icons (that are not correctly loaded). The button icons are modified in Home Assitant according to the state of the entities (currently lights and shutters).

Page source:

{"comment":"---- Config ---- ","page_size":"small_landscape","project_name":"openhasp"}

{"page":0,"comment":"---------- All Pages ----------"}
{"id":0,"bg_color":"#000000","text_color":"#978B7D"}
{"id":1,"obj":"btn","x":289,"y":1,"w":30,"h":30,"text_font":"2","text":"\uE5A9","text_color":"#000000","bg_opa":0,"border_width":0}
{"id":7,"obj":"btn","action":"prev","x":0,"y":210,"w":104,"h":30,"text":"\uE04D","radius":0,"border_side":0,"text_font":32}
{"id":8,"obj":"btn","action":"back","x":105,"y":210,"w":110,"h":30,"text":"\uE2DC","radius":0,"border_side":0,"text_font":32}
{"id":9,"obj":"btn","action":"next","x":216,"y":210,"w":104,"h":30,"text":"\uE054","radius":0,"border_side":0,"text_font":32}

{"page":1,"comment":"---------- Page 1 ----------"}
{"id":0,"enabled":false,"bg_color":"#ffd700","text_color":"#000000"}
{"id":1,"obj":"label","enabled":false, "x":1,"y":1,"w":120,"h":30,"text":"LICHT","text_font":24,"text_color":"#000000","radius":0,"border_side":0}

{"id":2,"obj":"btn1","x":10,"y":40,"w":120,"h":75,"toggle":true,"text":"\uE335","text_font":32,"mode":"break","align":1, "radius":5,"groupid":1}
{"id":3,"obj":"label","enabled":false, "x":140,"y":60,"w":40,"h":35,"text":"OG","text_font":32,"bg_color":"#2C3E50","radius":0,"border_side":0}
{"id":5,"obj":"btn2","x":190,"y":40,"w":120,"h":75,"toggle":true,"text":"\uE335","text_font":32,"mode":"break","align":1, "radius":5,"groupid":2}

{"id":12,"obj":"btn1","x":10,"y":125,"w":120,"h":75,"toggle":true,"text":"\uE335","text_font":32,"mode":"break","align":1, "radius":5}
{"id":13,"obj":"label","enabled":false, "x":140,"y":145,"w":40,"h":35,"text":"UG","text_font":32,"bg_color":"#2C3E50","radius":0,"border_side":0}
{"id":15,"obj":"btn2","x":190,"y":125,"w":120,"h":75,"toggle":true,"text":"\uE335","text_font":32,"mode":"break","align":1, "radius":5}

{"page":2,"comment":"---------- Page 2 ----------"}
{"id":0,"enabled":false,"bg_color":"#808080","text_color":"#FFFFFF"}
{"id":1,"obj":"label","x":0,"y":0,"w":120,"h":30,"text":"Rollos","text_font":24,"bg_color":"#2C3E50","text_color":"#FFFFFF","radius":0,"border_side":0}

{"id":2,"obj":"btn1","x":10,"y":40,"w":120,"h":75,"toggle":true,"text":"\uF11E","text_font":32,"mode":"break","align":1, "radius":5}
{"id":3,"obj":"label","enabled":false, "x":140,"y":60,"w":40,"h":35,"text":"OG","text_font":32,"bg_color":"#2C3E50","radius":0,"border_side":0}
{"id":5,"obj":"btn2","x":190,"y":40,"w":120,"h":75,"toggle":true,"text":"\uF11C","text_font":32,"mode":"break","align":1, "radius":5}

{"id":12,"obj":"btn1","x":10,"y":125,"w":120,"h":75,"toggle":true,"text":"\uF11E","text_font":32,"mode":"break","align":1, "radius":5}
{"id":13,"obj":"label","enabled":false, "x":140,"y":145,"w":40,"h":35,"text":"UG","text_font":32,"bg_color":"#2C3E50","radius":0,"border_side":0}
{"id":15,"obj":"btn2","x":190,"y":125,"w":120,"h":75,"toggle":true,"text":"\uF11C","text_font":32,"mode":"break","align":1, "radius":5}

{"comment":"---------- Limit page prev/next between 1 and 2 ----------"}
{"page":1,"id":0,"prev":2}
{"page":2,"id":0,"next":1}

This is the screenshot of page 1 as presented by the device:

And this the representation in the designer:

mvturnho / OpenHaspDesigner

Loading existing design - problems with button icons, page background color #1