diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 06906822..3edae467 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -19,9 +19,7 @@ jobs:
       matrix:
         config:
           # Cmdstan isntall not working on win-latest release; check back later
-          # - {os: windows-latest, r: 'release'}
-          # use 4.1 to check with rtools40's older compiler
-          - {os: windows-latest, r: '4.1'}
+        # - {os: windows-latest, r: 'release'}
           - {os: windows-latest, r: 'oldrel', rtools: '42'}
           - {os: ubuntu-latest, r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest, r: 'release'}
diff --git a/tests/testthat/test-binomial.R b/tests/testthat/test-binomial.R
index c5519016..c45a79d5 100644
--- a/tests/testthat/test-binomial.R
+++ b/tests/testthat/test-binomial.R
@@ -135,12 +135,25 @@ test_that("binomial() post-processing works", {
                        'mvgam_conditional_effects'))
   expect_loo(SW(loo(mod)))
 
-  dat_test$ntrials <- NULL
+  dat_test2 <- dat_test
+  dat_test2$ntrials <- NULL
   expect_error(plot(mod, type = 'trend',
-                    newdata = dat_test),
+                    newdata = dat_test2),
                'Variable ntrials not found in newdata')
-  expect_error(forecast(mod, newdata = dat_test),
+  expect_error(forecast(mod, newdata = dat_test2),
                'Variable ntrials not found in newdata')
+
+  mod <- SW(mvgam(cbind(y, ntrials) ~ series,
+                  trend_formula = ~ s(x, by = trend),
+                  family = binomial(),
+                  trend_model = AR(),
+                  data = dat_train,
+                  newdata = dat_test,
+                  burnin = 200,
+                  samples = 200))
+  fc <- forecast(mod)
+  expect_true(inherits(fc, 'mvgam_forecast'))
+  expect_no_error(plot_mvgam_uncertainty(mod))
 })
 
 # All tests should apply to beta_binomial as well