Create new variable in R based on certain values 2 years in a row

I am trying to use the UCDP Battle-related Deaths Dataset, called BattleDeaths_v22_1_conf from https://ucdp.uu.se/downloads/ (See under UCDP Battle-Related Deaths Dataset version 23.1)

I want to create a new variable or dataset that only includes countries with 1000 battle-related deaths 2 years in a row – and only after 2008.
However, I end up with a variable with no observations.

I used the dataset’s ‘country’ variable (location_id) and the battle-death variable (bd_best).

So far I have done this in R:

library(dplyr)

filtered_data <- subset(dput(BattleDeaths_v22_1_conf), bd_best >= 1000 & year >= 2008)

filtered_data <- filtered_data %>%
     arrange(location_inc, year) %>%
     group_by(location_inc) %>%
     mutate(sum_deaths_two_years = lag(bd_best) + bd_best)

So far so good.

final_data <- filtered_data %>%
      group_by(location_inc) %>%
      filter(all(sum_deaths_two_years >= 2000))

Now I end up with a variable with 0 observations. However, I can see in the original dataset, that there are observations that fit my criteria.