The use of row-reverse is not being rendered correctly as shown in the below HTML for the nested flex container which shows flex-direction:row.
Changing the outer container to also be row-reverse still doesn't correct the inner containers direction.
<div _ngcontent-gew-112=""
class="flex-container bottom-margin"
fxlayout="row-reverse"
fxlayoutalign="center center"
ng-reflect-layout="row-reverse"
ng-reflect-align="center center"
style="box-sizing: border-box;
max-height: 100%;
display: flex;
flex-direction: row;
justify-content: center;
align-items: center;
align-content: center;">
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fxlayout is not validfxLayout is validHere is a Plunkr
https://plnkr.co/edit/JcQRiKbeU0uB3m91RMHo?p=preview
The inner layout is set to row-reverse but always shows as row irrespecitive of the outer containers layout
@adrian-heath - This is a great Plnkr. Thank you very much!
You will laugh > the issue is simple and easy to stumble into. Your version is using binding to expression that is actually a static text value:
Yours:
<div [fxLayout]="row-reverse" class="colored box" >
Corrected
<div fxLayout="row-reverse" class="colored box" >

Closing as not-an-issue.
I've done that more than once myself.
Me too!
Turns out whilst I thought I had recreated as it was in my code, I'd missed something which does break row-reverse. I added fxLayoutAlign="center center" to the inner container and row-reverse was broken again. I'll create a separate issue since this one is now closed
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Most helpful comment
@adrian-heath - This is a great Plnkr. Thank you very much!
You will laugh > the issue is simple and easy to stumble into. Your version is using binding to expression that is actually a static text value:
Yours:
Corrected