Some of my maps that contain rasters get drawn partly only. The southern part of the map is cut off. It looks like some memory limit, but I have no idea if it is so. Another option is something concerning reprojection and bbox… Nevertheless, other rasters of the same crs work well in this project.

library(tmap)
library(tmaptools)
library(sf)
library(raster)
library(maps)

raster.file <-   tempfile()
download.file("https://github.com/andliszmmu/storage/raw/main/copernicus_2000.tif", raster.file, mode="wb")

ocean.pal   <- '#afdff9'
prj         <- CRS("+proj=eqdc +lat_0=57 +lon_0=46.8 +lat_1=69.4367 +lat_2=51.3043 +x_0=0 +y_0=0 +ellps=sphere +units=m +no_defs")
map_bbox    <- st_bbox(c(xmin = -1700000, ymin = -1780000, xmax = 1040000, ymax = 2330000), crs = prj)

land        <- st_as_sf(maps::map("world", plot = FALSE, fill = TRUE))
land        <- land[land$ID=='Russia',]
land        <- st_transform(land, prj)

model        <- raster(paste0(raster.file))

  tm =  
    tm_shape(land, bbox = map_bbox) +
    tm_fill(col = ocean.pal) +
    tm_shape(model)+
    tm_raster(style='fixed',
              breaks = c(0, 35,45,55,67,75,85,95,112, 200),
              palette=c('lightgreen', 'yellow', 'red', 'grey', 'white', 'blue', '#f21deb', 'darkgreen', 'green'),
              labels=c("a","b","c","d","e","f","g","h","i"),
              alpha = 1,
              #n=5,
              stretch.palette = FALSE,
              title = 'Landscape classification',
              legend.show = TRUE,
              legend.reverse = TRUE,
              legend.z=0) +
    tm_layout(frame = T,
              frame.lwd = 2,
              inner.margins = c(0,0,0,0),
              outer.margins = c(0.07, 0.127, 0.07, 0.112),
              asp = 39/56,
              legend.frame = T,
              legend.format = list(text.separator = "–"),
              legend.frame.lwd = 1,
              legend.outside = F,
              legend.position = c(0.001, 0.999),
              legend.just = c("left", "top"),
              legend.width = -0.32,
              legend.height = 0.9,
              legend.text.size = 0.7,
              legend.title.size = 1.1,
              legend.bg.color = "white",
              title.size = 0.7,
              title.bg.color = 'white',
              title.position = c('left', 'bottom')) +
    tmap_options(check.and.fix = TRUE,
                 max.raster = c(plot = 1e8, view = 1e8))
  
tm
    

I checked documentation and the web, but had not found solution.
Parameters of this raster are:
class : RasterLayer
dimensions : 2000, 1441, 2882000 (nrow, ncol, ncell)
resolution : 0.0343, 0.0179 (x, y)
extent : 19.64043, 69.06673, 41.19558, 76.99558 (xmin, xmax, ymin, ymax)
crs : +proj=longlat +datum=WGS84 +no_defs
source : copernicus_2000.tif
names : copernicus_2000
values : 20, 200 (min, max)
Raster downsampling (resolution <- 0.0343, 0.0343) did not help.