Paste this back into your data file and buttons should work again, just make sure your image links are actually working because those you currently have there are no longer up.
{
"BT": {
"uiType": "Overlay",
"panelType": "button",
"OffsetMin": "210 25",
"OffsetMax": "255 70",
"text": null,
"panelColor": "0 0 0 0",
"panelChatCmd": "ssb",
"imageUrl": "https://cdn.discordapp.com/attachments/1334374189129531495/1335544486964760586/hammer1.png?ex=67a08e3a&is=679f3cba&hm=8b7fa4a4b3154dbc0c53c7048efead824374abcdc1aa52cfa9dd3777f4597ec2&",
"imgAnchorMin": null,
"imgAnchorMax": null,
"onCmdHide": "true"
},
"SM": {
"uiType": "Overlay",
"panelType": "button",
"OffsetMin": "259 25",
"OffsetMax": "304 70",
"text": null,
"panelColor": "0 0 0 0",
"panelChatCmd": "sym_ui",
"imageUrl": "https://cdn.discordapp.com/attachments/1334374189129531495/1335545511582765066/Sym.png?ex=67a08f2f&is=679f3daf&hm=5b1489871c05fa479a89e08e9c2352c5584b214208b627d3572ecb8580d0e9e9&",
"imgAnchorMin": null,
"imgAnchorMax": null,
"onCmdHide": "true"
},
"remove": {
"uiType": "Overlay",
"panelType": "button",
"OffsetMin": "308 25",
"OffsetMax": "353 70",
"text": null,
"panelColor": "0 0 0 0",
"panelChatCmd": "remove all",
"imageUrl": "https://cdn.discordapp.com/attachments/1334374189129531495/1336842116306833528/remove.png?ex=67a546bd&is=67a3f53d&hm=89d51b605c984847a7726e12280c8d4434fdf7ada3bfd5bec29db1149235746e&",
"imgAnchorMin": null,
"imgAnchorMax": null,
"onCmdHide": "true"
},
"Menu": {
"uiType": "Overlay",
"panelType": "button",
"OffsetMin": "56 2",
"OffsetMax": "180 16",
"text": "<size=9>Build Menu</size>",
"panelColor": "0.5 0.5 0.5 0.45",
"panelChatCmd": "custombuttonstoggle",
"imageUrl": null,
"imgAnchorMin": null,
"imgAnchorMax": null,
"onCmdHide": "false"
}
}