check_gaps not found when using multisession

[robjhyndman]

This works ok if plan(multisession) is omitted.

library(tsibble)
#> 
#> Attaching package: 'tsibble'
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, union
library(fable)
#> Loading required package: fabletools
library(fable.tscount)


library(future)
plan(multisession)

tibble(time = 1:100, value = rpois(100, 3)) |> 
  as_tsibble(index=time) |> 
  model(TSCOUNT(value))
#> Warning: 1 error encountered for TSCOUNT(value)
#> [1] could not find function "check_gaps"
#> # A mable: 1 x 1
#>   `TSCOUNT(value)`
#>            <model>
#> 1     <NULL model>

^{Created on 2022-10-14 with reprex v2.0.2}