Tabs are disappearing

[pelis]

Envir: windows 10, node-red-dasboard: 2.15.4, node-red: 0.20.5

I have a very simple ui flow for testing (see attached flow).
It shows to text elements.
Each element is in its own tab/group (Tab 1 and Tab 2)
I have also added a ‘List’ tab which is empty, so it is not yet displayed.

Steps to reproduce:

• Insert a list widget
• Assign it to the ‘List’ tab
• Deploy
• Finally: Re-start the node-red server instance

Result:
You will only see the List tab, the other two tabs have disappeared.

[{"id":"3c820880.fc30e8","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"cd9118d5.56e548","type":"ui_base","theme":{"name":"theme-light","lightTheme":{"default":"#0094CE","baseColor":"#0094CE","baseFont":"-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif","edited":true,"reset":false},"darkTheme":{"default":"#097479","baseColor":"#097479","baseFont":"-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif","edited":false},"customTheme":{"name":"Untitled Theme 1","default":"#4B7930","baseColor":"#4B7930","baseFont":"-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"},"themeState":{"base-color":{"default":"#0094CE","value":"#0094CE","edited":false},"page-titlebar-backgroundColor":{"value":"#0094CE","edited":false},"page-backgroundColor":{"value":"#fafafa","edited":false},"page-sidebar-backgroundColor":{"value":"#ffffff","edited":false},"group-textColor":{"value":"#1bbfff","edited":false},"group-borderColor":{"value":"#ffffff","edited":false},"group-backgroundColor":{"value":"#ffffff","edited":false},"widget-textColor":{"value":"#111111","edited":false},"widget-backgroundColor":{"value":"#0094ce","edited":false},"widget-borderColor":{"value":"#ffffff","edited":false},"base-font":{"value":"-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"}},"angularTheme":{"primary":"indigo","accents":"blue","warn":"red","background":"grey"}},"site":{"name":"Node-RED Dashboard","hideToolbar":"false","allowSwipe":"false","lockMenu":"false","allowTempTheme":"true","dateFormat":"DD/MM/YYYY","sizes":{"sx":48,"sy":48,"gx":6,"gy":6,"cx":6,"cy":6,"px":0,"py":0}}},{"id":"6363a2ec.7b385c","type":"ui_tab","name":"Tab 1","icon":"dashboard","order":1},{"id":"68893c27.62fc04","type":"ui_group","z":"","name":"T1_G1","tab":"6363a2ec.7b385c","order":1,"disp":true,"width":"6","collapse":false},{"id":"39bd1ea1.df0862","type":"ui_tab","name":"Tab 2","icon":"dashboard","order":2},{"id":"1454ca37.99a5a6","type":"ui_group","z":"","name":"T2_G1","tab":"39bd1ea1.df0862","order":1,"disp":true,"width":"6","collapse":false},{"id":"84be94dd.0ad928","type":"ui_tab","z":"","name":"List","icon":"dashboard","order":3,"disabled":false,"hidden":false},{"id":"c8186c5f.286cf","type":"ui_group","z":"","name":"List","tab":"84be94dd.0ad928","order":1,"disp":true,"width":"6","collapse":false},{"id":"49d7f3bb.f15afc","type":"ui_text","z":"3c820880.fc30e8","group":"68893c27.62fc04","order":0,"width":0,"height":0,"name":"T1_G1","label":"text","format":"T1-G1 Hello","layout":"row-spread","x":175,"y":95,"wires":[]},{"id":"bf926275.6c778","type":"ui_text","z":"3c820880.fc30e8","group":"1454ca37.99a5a6","order":0,"width":0,"height":0,"name":"T1_G1","label":"text","format":"T2-G1 World","layout":"row-spread","x":175,"y":155,"wires":[]}]