Using constants as keys confuses formatting.
When a constant is used as a key, the plugin's indentation logic gets confused:
page {
10 {
{$backendLayoutUID.oneColumn} < lib.fluidTemplate.stdTemplate
{$backendLayoutUID.oneColumn} {
... # <--
} # <--
} # <--
}
Newlines at the marked positions won't result in a proper indentation in the new line.