"fixed" gt tables cause error when specifying widths in `plot_layout()`

[mccarthy-m-g]

Here's a reprex:

library(patchwork) # version 1.3.2
library(gt) # version 1.1.0

# Works:
wrap_table(gt(head(mtcars))) +
  plot_spacer() + 
  plot_layout(widths = c(2, 1))

# Fails:
wrap_table(gt(head(mtcars)), space = "fixed") +
  plot_spacer() + 
  plot_layout(widths = c(2, 1))
#> Error in `class<-`(unlist(lapply(x, as.unit), recursive = FALSE), c("unit",  : 
#> attempt to set an attribute on NULL